Mold



Feb. 28, 1928. 1 660 653 E. NESTLER MOLD Filed Dec. 4, 1924 WITNESS INVENTOR,

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7 which may be made any desired size trans claims.

Patented Feb. 28, 1928.

UNI-TED nMIL' nEsrLER; on NEW YORK, I1\T. Y., assrnon. To 1tEsrLER RUBBER rusrnefco;

, me.) or NEW Yemen, Y, A jcoRPoR rIQN ornnw YORK morn.

: Ap'plic'ation'fi led December 4,1924. SerialNo. 5533771 This invention relates to, molds and more particularly to tire molds for use invretreading tire shoes,an object ofithe invention being to provide a mold in. which'the tire or shoe can be securely held and a new tread fused to=the old tire or shoe.

A furtherbbject is to provide a mold versely byt-he insertion of strips which I term mold centers. In .oth'er 'words, a

'mold may be made-to accommodate any desired width of tire by inserting the proper width of center, and the sections of the mold with the center therein can be effectually clamped together so asto properly hold the tire and give to-it the desired surface or tread contouror ornamentation.

'A' further object isto' provide an improved construction of mold whichis especially adapted for use in connection with my improved clamp and steamless curing cabinet which form the subjects matter of separate applications SerialNos. 753,976 and 7 53,978, respectively.

With these and other objects in View, the invention consists in certain novel features of construction and combinations and arrangements of parts which will be more fully hereinafter described and pointedout in the In the accompanying drawings- Figure 1 is a perspective viewv of my im proved sectional mold showing the position of the tire therein; l v

Figure 2 is a view in transverse section through the center of the mold shown in Figure l; v

Figure 3 is a perspective view of a mold center;

Figure 4 is away illustrating my invention as embed ied in thecomplete mold;

Figure 5 is a perspective view of a ring center such as may be employed in the mold illustrated in Figure 4;

Figure 6 is a view. in transverse section through a modified form of mold center.

Referring more particularly to Figures 1,

2 and 3, 1 and 2 represent the two halves of while it may receive any desired portion of the tire I preferably construct the same to receive one-fourth of the tire so that in completing the 'retreading'of the tire it is necessary to give-or impart four: operationsto the tire','a fourth of the tirebeing treated at 1 each time.

Inother words, after one section ofthe tireis treated it is removed and given. a quarter; ofa turn and then replaced in .the'mold wan'd this operation is repeated until the entire surface of the tire has been treated and the tire orshoe com- Pletely 'retr-eaded. v 1

The mold sections 1 and'2 are of proper cross sectional shape to conform. to the shape of the tire or shoe and may be given any desiredinternal contour, as indicated at 3, to give} the tread ofthe shoe the desired surface-formation. ---.The.mold members 1 and 2 are formed, externally at their inner edges with flanges'e ifo-r the reception of the mold.

This moldcenter comprises a" strip of metal conforming in length to the length of the mold and of such shape as to fit the recesses 7 and be securely clamped by the bolts 5 and 6. The mold center may be plain or smooth or it may have any desired 7 contour, and it will be readily seen that by substituting a narrower or wider center the bolts 5 and nuts 6 to clamp tllQ'Il'lOldmem- Y widthof the mold as a whole can be varied to suit any width of tire or shoe. The mold members 1 and 2=are provided at opposite sides with relatively straight and normally horizontal webs 9 which serve i e j as supports to the mold and as partial top a plan view partly broken plates for a heater or cabinet such as set or tire is supplied with the necessary thick ness of rubber in accordance with my improved process, and then placed in themold and secured by clamps which form the Subject matter of my co-pending appli cation above referred to. While the tire 15 thus held .it is subjectedto dry heat at the proper temperature for the desired length of time so that therubber of the shoe is completely fused and theproper surface given to the shoe. When this section of the- 4 and 5 I show my invention in connection shoe is treated itis removed and turned to present another one-quarter of theshoe to the mold, and the operation isrepeated "until'the entire surface of the shoevis formed. In the modification illustrated in Figures with a complete mold A'. "Thisrn'old' is made up of a circular series of sections 10- and while I have shown four of these sections it is obvious that'the invention is not limited to any particular number.

These sections "10 are provided with i I a flanges 11 at their ends secured by bolts 12 and nuts 13;. and Within the complete mold a, ringcente'r l l'is providedw-hich gives to the mold the desired width and performs a function precisely like that of the mold bentext above described except that it is acomplete ring.

I :The operation ofthismodified form of mold is precisely like thatof the preferred jected portions 16 therein to provide re 'cesses in the tread-of the tire, "and it is obvious that by shaping the ring centers and the interior ofthe mold any desired surface h sh e or t contour or ornamentation may be given to Various" sli ghtchanges "and? alterations might be made in the generaliform of the parts described. without departing froml iny invention, and hence IidoInot-liinit myself to the precise details set forth but consider myself at liberty to make such slight changes andalterations as fairly fall with in-the'. spiritand scope of the appended claims. r I

I claim:

1'. A tire mold of thech-aracter described,

including a pair of sections spaced apart and'having recesses in the r mold-faces at their inner edges, and a strlp. held in said recesses and having its inner face concentrio with the inner faces of the sections and constituting a'portion of the 1nold,face.-

2. A tire'mold of the character described, including an annular'series of spaced secall of the sections havinggroovesor a strip located tions, recesses at thelr lnneredges, in said grooves or recesses, and means securing the sections t0gether--and clamping thestrip in place, said strip having its in,-

ner face concentric with the inner faces of the sections andconstituting aportion of the mold face formed by said sections. 7 

